• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.366-369
• /
• 2003

High T$_{c}$ superconducting lines will be applied as key materials in the areas of power transmission line; magnetic levitation of vehicle; magnetic separation; magnetic energy storage and marine propulsion. A combination method of electrophoresis deposition and zone-melting for preparation of YBaCuO tape is proposed. The submicron particle powder of YBaCuO made by sol-gel method is used in the electrophoresis process. A 40~50${\mu}{\textrm}{m}$ thickness of YBaCuO film on Ag plate could be deposited in about three minutes. After deposition the film is rolled and heat treated in order to increase the density and the adhesion of the film to the Ag plate. Silver(Ag) and lead oxide(PbO) were added in the YBaCuO powder in order to reduce its melting point. The YBaCuO coating with controlled Ag and PbO contents was preliminarily zone-melted at about 945$^{\circ}C$.>.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.14 no.1
• /
• pp.69-73
• /
• 2001

In this study, we fabricated Bi-2223/Ag high temperature superconducting tapes using PIT(Powder-In-Tube) process to apply the superconducting magnet, cable and etc. It is inevitable to deform the superconducting taps with axial strain for application. Therefore, for the characterization of the strain sensitivity of the superconducting properties, the degradation of Bi-2223/Ag tapes due to axial strain were investigated by measuring the critical current as a function of applied tension strain and external magnetic field. The critical current of Bi-2223/Ag tapes were decreased slightly up to 0.3∼0.4% applied strain but, drastically decreased more than these strains. Superconducting filament cores consisted of brittle ceramic fibers were broken easily by the large strain and current path were decreased simultaneously.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
• /
• 2001.02a
• /
• pp.104-107
• /
• 2001

Racetrack coils are used in many areas of superconductivity applications such as generators, motors, maglev, wiggler magnets and so on. Especially now a days a few advanced nations including U.S., Japan are developing high temperature superconducting(HTS) wire which has better performance than low temperature superconducting(LTS) wire. Most of HTS wires such as BSCCO-2223 are manufactured with PIT(Power In Tube) process, so the shape of the wire looks like tape different from LTS wire with round cross-sectional appearance like normal conductors. Generally HTS racetrack coils are composed of a few partial double-pancake colis and then the double-pancakes are jointed each other according to their applications.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.2 no.1
• /
• pp.1-8
• /
• 2002

It has been integrated into several navigation systems. This paper shows that system recognizes difficult indoor roads without any specific marks such as painted guide line or tape. In this method the robot navigates with visual sensors, which uses visual information to navigate itself along the read. The Neural Network System was used to learn driving pattern and decide where to move. In this paper, I will present a vision-based process for AMR(Autonomous Mobile Robot) that is able to navigate on the indoor read with simple computation. We used a single USB-type web camera to construct smaller and cheaper navigation system instead of expensive CCD camera.

• 제어로봇시스템학회:학술대회논문집
• /
• 2002.10a
• /
• pp.91.1-91
• /
• 2002

1. Introduction Present study presents the basic concept of a Solid Freeform Fabrication System using a rapid prototyping procedure and optimal control for a transferring and accumulating system. And it developed a novel rapid prototyping process that can use ceramic or metal as well as polymer as a basic material. 2. Solid Freeform Fabrication System 2.1 Basic Theory A 3D CAD data of the model is converted to the 2D cross-section data of the slides. A ceramic or metal tape of thickness 0.5-1.5mm is cut by a laser beam with the cross-section data of the slide. A 3D model was obtained by transferring and accumulating the slides. The final product is manufactured by sin...

• Proceedings of the Korean Society For Composite Materials Conference
• /
• 2004.10a
• /
• pp.171-174
• /
• 2004

In order to improve the damage tolerance of the conventional laminated composites, three­dimensional fiber structures incorporated with stitching yams have been utilized in this study. From the newly developed process termed as TAPIS(TApe Placement Incorporated with Stitching), carbon/epoxy composites have been fabricated. Two-dimensional composites with the same stacking sequence as 3D counterparts have also been fabricated for the property comparison. To examine the damage resistance performance the low speed drop weight impact test has been adopted. For the assessment of damage after the impact loading, specimens were subjected to C-scan nondestructive inspection compression after impact(CAI) were also conducted to evaluate residual compressive strength. Although the damage area of 3D composites was greatly reduced$(30-40\%)$ compared with that of 2D composites, the CAI strength did not show drastic improvement.

• Proceedings of the Computational Structural Engineering Institute Conference
• /
• 2006.04a
• /
• pp.15-20
• /
• 2006

Real time health monitoring system was studied to detect the . generation of defects in the composite structures during service life. The PZT sensors were embedded into the woven-glass/phenol composite plate during the fabrication. VARTM (Vacuum Assisted Resin Transfer Molding) process were used to fabricate the composite plate. A Teflon tape was embedded between glass fiber layers to mimic delamination induced during service. Normalized maximum amplitude and energy analyses were used for the acquired signals. Both amplitude and energy of acquired signals were extremely sensitive to the delamination. Therefore, it was successful to detect and to locate the defects in composite plate by monitoring signals from sensors and using the proposed method.

• IE interfaces
• /
• v.4 no.2
• /
• pp.93-101
• /
• 1991

One of the major problems on the design of an online database for machine readable data file is on the implementation of MARC format for communication with the Library of Congress or OCLC. Most of the cataloging data to make manual card catalogs are stored on magnetic tapes based on the MARC format at LC or OCLC and are sent to local libraries. Therefore, local libraries can avoid the expensive process of cataloging for the books they own. Instead, they can retrieve the necessary cataloging information from the tape and print out manual card catalogs. A problem with MARC is that it is not designed for databases, but for portability to be read at any type of computer. Therfore, it is not practical to use the format on the development of an online database as long as the database is developed in conjunction with a commercial powerful database package. In this paper a possible methodology to resolve the conflicts between the objective of DBMS and MARC is discussed. It is to satisfy the requirements from a commercial DBMS while leaving a room for MARC to communicate with LC and OCLC.

• Journal of the Korean Society of Costume
• /
• v.61 no.6
• /
• pp.1-14
• /
• 2011

With the trend of wearing mountaineering wear as casual apparel as well as a continuous increase of mountaineers, mountaineering wear market has rapidly grown. New techniques to improve mountaineering apparel have been developed. Construction Without Sewing(CWS) is one of them. It is a sewing technique to improve performance and functions of new functional mountaineering apparel. CWS employs a welding machine with an adhesive tape and press instead of sewing so that it makes the apparel lighter and have better wearability, durability, and windproof and waterproof function, than sewed apparel. This study focuses on the concept, nature, and applications of the mountaineering wear manufactured by CWS. It also made an analysis of manufacturing process, and proposed three designs for the mountaineering wear created by CWS. With introducing the merits of CWS, the costumers will be have better understanding of CWS and break their stereotype that functional clothing is simply expensive without considering its benefits.

• Proceedings of the KIEE Conference
• /
• 2002.11b
• /
• pp.286-289
• /
• 2002

The partial pischarge(PP) process in synthetic laminated paper insulation was studied at cryogenic condition using different types of the test samples(flat and tube type). The influence of semiconducting carbon paper was also evaluated by studying the electrical properties of superconducting cable.